Insulin-like growth factor 1 and growth seasonality in reindeer (Rangifer tarandus) - comparisons with temperate and tropical cervids
Growth in temperate and arctic deer is seasonal, with higher growth rates in spring and summer while growth rates are low or negative in autumn and winter. We have measured IGF1 concentrations in the plasma of reindeer calves exposed to a manipulated photoperiod, indoors, of either 16 hours light fo...
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Septentrio Academic Publishing
1993
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ftdoajarticles:oai:doaj.org/article:48606ce9ad364bd4b0cbc7858949d72a 2023-05-15T15:11:49+02:00 Insulin-like growth factor 1 and growth seasonality in reindeer (Rangifer tarandus) - comparisons with temperate and tropical cervids J. M. Suttie R. G. White T. R. Manley B. H. Breier P. D. Gluckman P. F. Fennessy K. Woodford 1993-12-01T00:00:00Z https://doi.org/10.7557/2.13.2.1095 https://doaj.org/article/48606ce9ad364bd4b0cbc7858949d72a EN eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/rangifer/article/view/1095 https://doaj.org/toc/1890-6729 doi:10.7557/2.13.2.1095 1890-6729 https://doaj.org/article/48606ce9ad364bd4b0cbc7858949d72a Rangifer, Vol 13, Iss 2 (1993) reindeer photoperiod IGF1 growth seasonality cervids Animal culture SF1-1100 article 1993 ftdoajarticles https://doi.org/10.7557/2.13.2.1095 2022-12-31T10:16:10Z Growth in temperate and arctic deer is seasonal, with higher growth rates in spring and summer while growth rates are low or negative in autumn and winter. We have measured IGF1 concentrations in the plasma of reindeer calves exposed to a manipulated photoperiod, indoors, of either 16 hours light followed by 8 hours dark each day (16L:8D) (n = 3) or 8L:16D (n = 3) from about the autumnal to the vernal equinox, to determine whether the seasonal growth spurt normally seen in spring is associated with changes in the circulating level of IGF1. A high quality concentrate diet was available ad libitum. The animals were weighed, and bled every 2 weeks and plasma samples assayed for IGF1 by radioimmunoassay. 6-8 weeks after the start of the study those calves exposed to 16L.-8D showed a significant increase in plasma IGF1 concentration which was maintained until the close of the experiment, 24 weeks after the start. In contrast IGF1 plasma concentrations in those calves exposed to a daylength of 8L:16D did not significantly alter during the study. The elevated IFG1 in the 16L:8D group was associated with rapid weight gain compared with the 8L:16D group. We have shown that the seasonal growth spurt is preceded by an elevation in plasma IFG1 concentration. Further, this elevation in IGF1 is daylength dependent. For comparison IGF1 and growth rate seasonal profiles from temperate and tropical deer are included. This comparison reveals that seasonal increases in IGF1 take place only in animals with a seasonal growth spurt. Thus IGF1 plasma level elevations seem most closely associated with the resumption of rapid growth in spring following the winter. Article in Journal/Newspaper Arctic Rangifer Rangifer tarandus Directory of Open Access Journals: DOAJ Articles Arctic Rangifer 13 3 91 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
reindeer photoperiod IGF1 growth seasonality cervids Animal culture SF1-1100 |
spellingShingle |
reindeer photoperiod IGF1 growth seasonality cervids Animal culture SF1-1100 J. M. Suttie R. G. White T. R. Manley B. H. Breier P. D. Gluckman P. F. Fennessy K. Woodford Insulin-like growth factor 1 and growth seasonality in reindeer (Rangifer tarandus) - comparisons with temperate and tropical cervids |
topic_facet |
reindeer photoperiod IGF1 growth seasonality cervids Animal culture SF1-1100 |
description |
Growth in temperate and arctic deer is seasonal, with higher growth rates in spring and summer while growth rates are low or negative in autumn and winter. We have measured IGF1 concentrations in the plasma of reindeer calves exposed to a manipulated photoperiod, indoors, of either 16 hours light followed by 8 hours dark each day (16L:8D) (n = 3) or 8L:16D (n = 3) from about the autumnal to the vernal equinox, to determine whether the seasonal growth spurt normally seen in spring is associated with changes in the circulating level of IGF1. A high quality concentrate diet was available ad libitum. The animals were weighed, and bled every 2 weeks and plasma samples assayed for IGF1 by radioimmunoassay. 6-8 weeks after the start of the study those calves exposed to 16L.-8D showed a significant increase in plasma IGF1 concentration which was maintained until the close of the experiment, 24 weeks after the start. In contrast IGF1 plasma concentrations in those calves exposed to a daylength of 8L:16D did not significantly alter during the study. The elevated IFG1 in the 16L:8D group was associated with rapid weight gain compared with the 8L:16D group. We have shown that the seasonal growth spurt is preceded by an elevation in plasma IFG1 concentration. Further, this elevation in IGF1 is daylength dependent. For comparison IGF1 and growth rate seasonal profiles from temperate and tropical deer are included. This comparison reveals that seasonal increases in IGF1 take place only in animals with a seasonal growth spurt. Thus IGF1 plasma level elevations seem most closely associated with the resumption of rapid growth in spring following the winter. |
format |
Article in Journal/Newspaper |
author |
J. M. Suttie R. G. White T. R. Manley B. H. Breier P. D. Gluckman P. F. Fennessy K. Woodford |
author_facet |
J. M. Suttie R. G. White T. R. Manley B. H. Breier P. D. Gluckman P. F. Fennessy K. Woodford |
author_sort |
J. M. Suttie |
title |
Insulin-like growth factor 1 and growth seasonality in reindeer (Rangifer tarandus) - comparisons with temperate and tropical cervids |
title_short |
Insulin-like growth factor 1 and growth seasonality in reindeer (Rangifer tarandus) - comparisons with temperate and tropical cervids |
title_full |
Insulin-like growth factor 1 and growth seasonality in reindeer (Rangifer tarandus) - comparisons with temperate and tropical cervids |
title_fullStr |
Insulin-like growth factor 1 and growth seasonality in reindeer (Rangifer tarandus) - comparisons with temperate and tropical cervids |
title_full_unstemmed |
Insulin-like growth factor 1 and growth seasonality in reindeer (Rangifer tarandus) - comparisons with temperate and tropical cervids |
title_sort |
insulin-like growth factor 1 and growth seasonality in reindeer (rangifer tarandus) - comparisons with temperate and tropical cervids |
publisher |
Septentrio Academic Publishing |
publishDate |
1993 |
url |
https://doi.org/10.7557/2.13.2.1095 https://doaj.org/article/48606ce9ad364bd4b0cbc7858949d72a |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Rangifer Rangifer tarandus |
genre_facet |
Arctic Rangifer Rangifer tarandus |
op_source |
Rangifer, Vol 13, Iss 2 (1993) |
op_relation |
https://septentrio.uit.no/index.php/rangifer/article/view/1095 https://doaj.org/toc/1890-6729 doi:10.7557/2.13.2.1095 1890-6729 https://doaj.org/article/48606ce9ad364bd4b0cbc7858949d72a |
op_doi |
https://doi.org/10.7557/2.13.2.1095 |
container_title |
Rangifer |
container_volume |
13 |
container_issue |
3 |
container_start_page |
91 |
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1766342611344293888 |